Spring clamps need a tool to open. The clamp closes on the wire to provide dynamic clamping; this extra holding action withstands vibration. Spring clamp technology is especially suited for top entry connections. The top entry of the wire into the spring block allows use where space is limited; for example, between the terminal block and nearby panel components such as wire duct. The spring block technology was developed approximately 20 years ago to offer an alternative to the then only screw clamp technology for easy field and factory wiring. The wire is retained in the clamp by the force of the spring that pushes the wire against the connecting bar as shown in the illustration. Spring clamp technology is used in applications where small wire sizes are being used, generally below 10 AWG. The reliability and quality of the connection is demonstrated by compliance with all worldwide standards including UL, CSA, and IEC.
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